YouTube Premium episode info not extracted for trending videos

[nyuszika7h]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.07.12
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-o', '%(series)s S%(season_number)02dE%(episode_number)02d %(episode)s %(height)dp.%(ext)s', 'https://www.youtube.com/watch?v=SgJtS0BU-UY']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.07.12
[debug] Python version 3.5.3 (CPython) - Linux-4.9.0-9-amd64-x86_64-with-debian-9.9
[debug] exe versions: ffmpeg N-94165-g6e988b75df, ffprobe N-94165-g6e988b75df
[debug] Proxy map: {}
[youtube] SgJtS0BU-UY: Downloading webpage
[youtube] SgJtS0BU-UY: Downloading video info webpage
[youtube] {22} signature length 109, html5 player vflK6rDhN
[youtube] {43} signature length 109, html5 player vflK6rDhN
[youtube] {18} signature length 109, html5 player vflK6rDhN
[youtube] {313} signature length 105, html5 player vflK6rDhN
[youtube] {271} signature length 105, html5 player vflK6rDhN
[youtube] {137} signature length 105, html5 player vflK6rDhN
[youtube] {248} signature length 105, html5 player vflK6rDhN
[youtube] {136} signature length 109, html5 player vflK6rDhN
[youtube] {247} signature length 109, html5 player vflK6rDhN
[youtube] {135} signature length 109, html5 player vflK6rDhN
[youtube] {244} signature length 105, html5 player vflK6rDhN
[youtube] {134} signature length 105, html5 player vflK6rDhN
[youtube] {243} signature length 109, html5 player vflK6rDhN
[youtube] {133} signature length 109, html5 player vflK6rDhN
[youtube] {242} signature length 109, html5 player vflK6rDhN
[youtube] {160} signature length 109, html5 player vflK6rDhN
[youtube] {278} signature length 109, html5 player vflK6rDhN
[youtube] {140} signature length 105, html5 player vflK6rDhN
[youtube] {171} signature length 109, html5 player vflK6rDhN
[youtube] {249} signature length 105, html5 player vflK6rDhN
[youtube] {250} signature length 109, html5 player vflK6rDhN
[youtube] {251} signature length 105, html5 player vflK6rDhN
[youtube] {256} signature length 109, html5 player vflK6rDhN
[youtube] {258} signature length 105, html5 player vflK6rDhN
[debug] Default format spec: bestvideo+bestaudio/best
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[debug] Invoking downloader on 'https://r3---sn-4g5ednsr.googlevideo.com/videoplayback?expire=1562953798&ei=5nMoXcqjK8Sz8gOpn6m4CA&ip=2a01%3A4f8%3A161%3A53e5%3A%3A2&id=o-AAqAEIQIh8qAvCm91PT4k
h-hglwnDjhuXNU7cmmSUy87&itag=313&aitags=133%2C134%2C135%2C136%2C137%2C160%2C242%2C243%2C244%2C247%2C248%2C271%2C278%2C313&source=youtube&requiressl=yes&mm=31%2C29&mn=sn-4g5ednsr%2Csn-4g5e6nze
&ms=au%2Crdu&mv=m&mvi=2&pl=43&gcr=de&initcwndbps=782500&mime=video%2Fwebm&gir=yes&clen=2847083741&dur=2017.598&lmt=1559324335037633&mt=1562932046&fvip=3&keepalive=yes&c=WEB&txp=6516222&sparam
s=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cgcr%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&lsparams=mm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AHylml4wRAIgOQTPp1dUf67ySU5dp7TVyX2fT9ddS
fpdARG3cB-APIYCIBcdsUxHvvL6e6R8Tuc5453wpGfb5ZYKf5RHSEZzb9XL&sig=ALgxI2wwRAIgNyiyi7J0QE53P3JU1G1d-yE9NheJ2fUE1cvljuI4hxoCIBdR9q0exES6bG8Mg2yEDXJJjt9v4OpNt9cfR3nHl2pZ&ratebypass=yes'
[download] Destination: NA SNAENA NA 2160p.f313.webm
[download]   1.5% of 2.65GiB at 45.93MiB/s ETA 00:58^C
ERROR: Interrupted by user

Description

When a video is trending, the usual way of extracting the episode info for YouTube Premium series doesn't work. This can be circumvented by either using a country where it's not trending, or changing the way the info is extracted.

% curl -s 'https://www.youtube.com/watch?v=SgJtS0BU-UY&gl=US&hl=en&has_verified=1&bpctr=9999999999' | grep -A1 watch7-headline
      <div id="watch7-headline" class="clearfix">
        <span class="standalone-collection-badge-renderer-text"><a href="/feed/trending" class=" yt-uix-sessionlink      spf-link " data-sessionlink="ei=SnQoXe3_GIuo7gPv4ryABw" >#2 on Trending</a></span>

% curl -s 'https://www.youtube.com/watch?v=SgJtS0BU-UY&gl=DE&hl=en&has_verified=1&bpctr=9999999999' | grep -A1 watch7-headline
      <div id="watch7-headline" class="clearfix">
        <span class="standalone-collection-badge-renderer-text"><b><a href="/playlist?list=PLRfpyIF9ZtKKGplgKE3JxuHGaF3HMvZtq" class=" yt-uix-sessionlink      spf-link " data-sessionlink="ei=T3QoXbjICdOW1gLNgImYBA" >Escape the Night</a></b> S4 • E1</span>

This is a basic regex that could work on the video title and would also extract the episode title, but it becomes ambiguous if the series and/or episode title contains a hyphen:

>>> re.fullmatch(r'(.+) - (.+) S(\d+) \(Ep (\d+)\)', 'Collecting The Dead: Part 1 - Escape the Night S4 (Ep 1)').groups()
('Collecting The Dead: Part 1', 'Escape the Night', '4', '1')